Aluminum Balls

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Broad Question

How far does the aluminum ball sink?

Specific Question

Does a large, small or medium ball float or sink?

Variables

Independent Variable: Size of Ball

Dependent Variable: Depth (cm)

Variables That Need To Be Controlled:

Water depth

Bowl

Drop from same height.

Hypothesis

I hypothesize that the small will sink the furthest, followed by the medium and then the large.

Graph of Hypothesis

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Experimental Design

We are going to do in Aluminum Ball down stairs. Three people will be involved on doing this test. We will be testing it six times. We will be writing the data on a computer. We will be using Karissa‘s camera.

Materials List

• Water
• Ruler
• Bowl
• Pencil
• Aluminum Foil

Detailed Procedure

1. Gather Materials

2. Make one big aluminum ball

3. Fill bowl with water.

4. Drop aluminum ball from 50cm.

5. Let ball sit for three minutes.

6. Measure depth that ball sinks.

7. Record data on data table.

8. Crunch ball so it is medium sized.

9. Repeat steps 4-7.

10. Crunch ball so it is small sized.

11. Repeat steps 4-7.

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Background Research

• Floating: If an object is less dense then water it will float. Sinking: If an object is more dense then water it will sink.
• Small amount of Mass Float Mass = Sink in water. The reason why things sink or float is because the gravity is pulling it down to make it sink. Density determines if an object will sink or Float. Objects that are more dense than water will sink. Objects that are less dense than water will float.
• Buoyancy arises from fluid pressure and increases from the depth that it gets. The increased pressure is also exerted from all directions so the unbalanced force that makes the upward force on the bottom of the submerged object. if a object weighs more than the water displaces the object will sink. A object will also float in either gas or liquid if there is buoyancy. When density the ratio of mass to volume of an object matches the density of surrounding fluids it will neither sink or float. but it will also remain suspended in fluid. Buoyancy(N)
  

  density of fluid(kg m -3) x acceleration due to gravity (m s -2 ) x volume of the immersed part of the object (m 3). =

References

"Sink, Float, Density, Surface Tension Misconceptions." Hun-Tel.net. Web. 20 Jan. 2012. <http://www.huntel.net/rsweetland/science/misconceptions/densitysurftensi.html>.

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Results

Data Table

Graphs

Photos

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Data Analysis

Conclusion

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Discussion